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## Optical constants of OHARA - BSM (Borosilicate, medium-index)

S-BSM71

Wavelength:
µm

(0.34 – 2.4)

### Complex refractive index (*n+ik)*

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.50847885λ^2}{λ^2-0.00812769076}+\frac{0.158099826λ^2}{λ^2-0.0354200898}+\frac{1.36815368λ^2}{λ^2-136.110038}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: -8.87e-07 1.45e-08 2.75e-12 6.65e-07 1.72e-09 0.146 nd: 1.648498 Vd: 53.023881 glass_code: 649530 density: 3.74 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 7.1e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 8.3e-06 K^{-1}dPgF: -0.001 climatic_resistance: 2.0 acid_resistance: 53.2 phosphate_resistance: 4.0

### Comments

Recommended

### References

OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp)

See also OHARA glass data sheets